Year	Percent
1999-01-01	9.400
2000-01-01	12.225
2001-01-01	12.175
2002-01-01	15.250
2003-01-01	13.525
2004-01-01	15.450
2005-01-01	13.500
2006-01-01	9.775
2007-01-01	8.200
2008-01-01	6.450
2009-01-01	7.675
2010-01-01	10.125
2011-01-01	10.050
2012-01-01	11.225
2013-01-01	11.050
2014-01-01	10.575
2015-01-01	9.350
2016-01-01	9.000
2017-01-01	6.025